Listen At $173, a firm can sell 18,135 stereo earphones (3.5 mm for android). These are premium earphones, guaranteed for 5 years. At this price, elasticity is estimated at 0.5. What is the change in total revenue (+ or -) if the firm drops price by 9%? Your Answer: Answer Question 9 (10 points) Listen A firm sells mid-range snowboards and estimates its demand curve to be Q = 14,900 25(P). Variable costs are $224. At what price does the firm's total contribution margin equal zero